In the early days of UV printers, the curing system used mercury lamps. The harm caused by mercury lamps to the human body includes the following aspects: ultraviolet radiation, high temperatures, and ozone. Prolonged direct exposure of the skin to the lamp can cause certain burns. Moreover, the light from mercury lamps can also kill some of the body's white blood cells, which is very damaging to health.
Additionally, if a mercury lamp breaks and the liquid inside leaks out, it can release ozone. Long-term inhalation of ozone can also affect the human nervous system.
However, with the advancement of technology, modern UV printers are now all equipped with LED cold light sources.
First of all, the curing method and principle of LED are completely different from those of mercury lamps. LED does not rely on temperature to cure like mercury lamps do; instead, it uses specific wavelength bands to cure the ink. As a result, it only generates mild heat, so the possibility of skin burns is almost nonexistent. Of course, it is still a light source — if you stare directly at it for too long, it may still cause some eye discomfort.
Furthermore, the structure of LED lamp beads is completely different from that of mercury lamps. Therefore, during operation, it does not produce ozone at all, and there is no risk of mercury leakage. As a result, the harm to the human body is virtually negligible.